linux-kernel - Re: cgroups(7): documenting /sys/kernel/cgroup files

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Message-ID: <20180110140239.GX3668920@devbig577.frc2.facebook.com>
Date:   Wed, 10 Jan 2018 06:02:39 -0800
From:   Tejun Heo <tj@...nel.org>
To:     Roman Gushchin <guro@...com>
Cc:     "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        linux-man <linux-man@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        "open list:CONTROL GROUP (CGROUP)" <cgroups@...r.kernel.org>
Subject: Re: cgroups(7): documenting /sys/kernel/cgroup files

Hello,

On Wed, Jan 10, 2018 at 04:44:14AM -0800, Roman Gushchin wrote:
> cgroup.threads is not listed because it's not delegatable (doesn't have
> CFTYPE_NS_DELEGATABLE flag set). I don't know if it was intended or just
> an accident (I believe the latter).

So, thread mode isn't delegatble.  Marking a cgroup as threaded turns
that subtree threaded and join the parent's domain, so we can't allow
delegation roots to be turned threaded - just like we can't mark the
root cgroup threaded, and I'm not really not sure what it means to
delegate a portion of threaded subtree.

Thanks.

-- 
tejun